body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: #001f3f;
    color: #fff;
    overflow-x: hidden;
    height: 100vh;
}

/* 左侧导航栏 */
.sidebar {
    background: linear-gradient(135deg, #002b4d, #003366);
    height: 100vh;
    padding: 20px 0;
    box-shadow: 2px 0 10px rgba(0, 240, 255, 0.2);
    overflow-y: auto;
}

.sidebar-header {
    color: #00f0ff;
    font-size: 18px;
    font-weight: bold;
    padding: 0 20px 20px;
    border-bottom: 1px solid rgba(0, 240, 255, 0.3);
    margin-bottom: 20px;
}

.category-title {
    color: #00f0ff;
    font-size: 14px;
    text-transform: uppercase;
    padding: 0 20px 5px;
    margin-top: 15px;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    padding: 10px 20px;
    color: #e0e0e0;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
}

.nav-item:hover {
    background-color: rgba(0, 240, 255, 0.1);
    color: #00f0ff;
}

.nav-item.active {
    background-color: #00f0ff;
    color: #001f3f;
    font-weight: bold;
}

/* 右侧内容区 */
.content-area {
    padding: 20px;
    height: 100vh;
    overflow-y: auto;
    background-color: #001a33;
}

/* 指标卡 */
.metrics-bar {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}

.metric-card {
    flex: 1;
    background: linear-gradient(135deg, #002b4d, #003d6b);
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 0 8px rgba(0, 240, 255, 0.2);
}

.metric-value {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 5px;
    color: #fff;
}

.metric-label {
    font-size: 12px;
    color: #00f0ff;
}

/* 图表样式 */
.chart-title {
    color: #00f0ff;
    margin-bottom: 20px;
    font-size: 22px;
    font-weight: 600;
}

.chart-container {
    background: linear-gradient(135deg, #002b4d, #003366);
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 0 8px rgba(0, 240, 255, 0.2);
    margin-bottom: 20px;
    height: 500px;
}

.chart-area {
    width: 100%;
    height: 100%;
}

/* 图表说明 */
.chart-description {
    background-color: rgba(0, 240, 255, 0.05);
    border-left: 3px solid #00f0ff;
    padding: 15px;
    border-radius: 0 4px 4px 0;
    color: #e0e0e0;
    line-height: 1.6;
    font-size: 14px;
}